* All persons in this story are at least 18 years of age *
Sakura had been asleep on her bed, exhausted from the evening of playing with Benjiro and Kira, but was awoken by a squishing sound nearby. Her eyes opened slowly and a light source caught her attention beside the bed. It was her tablet, propped up on one of the floor cushions, and familiar moaning and slapping sounds were coming from the video that was playing. The sound was almost all the way down and she probably would've slept right through it, but the masturbator toy bouncing on Benjiro's lap was what roused her. He was sitting with his back against her bed frame and fucking the toy as he watched an anal porn video.
He must have heard her rustling under her covers, and he glanced back and smiled at her. "Oh, sorry. I thought I was being quiet."
She yawned and rubbed at her eyes before sitting up and getting a better look at him. He was balls deep in the fake pussy of the masturbator and just held it there in his lap while they talked.
"It's fine," she said sleepily. "Don't stop on my account."
He looked back at the video and began bouncing the toy on his cock again. She just sat there and watched him go at it, too tired to be excited all that much, but too intrigued to go back to sleep. She saw how he fucked the device and knew it must have felt really good for him. He could barely thrust into it the way he was sitting on the floor so he was grinding it and focusing on staying deep inside.
"You wanna fuck it on my bed?" she offered.
Benjiro thought for a moment, and then nodded. "Thanks."
He stood, his cock still buried inside the toy, and he set it on top of her mattress next to her. He could still see the porn video from this angle and immediately went to town on the squishy object. Sakura watched as his cock withdrew and then plunged back inside, over and over, and every so often he would trade holes and fuck the anus of the toy for a few thrusts before going back to the pussy. He seemed to like trading off like that and she mentally took note. These were the details that would serve them well in the future, after all. She personally had a lot of interest in anal sex but had never tried it before, so knowing that he enjoyed it (or at least a mimic of it with the masturbator) was interesting to her.
Her pussy started to moisten as he began to get a bit more frenzied, thrusting firmly and going as deep as he could into the asshole. His neck was starting to flush and he was groaning with each thrust.
"Getting close," he said, as if he needed to announce his impending orgasm like they were in the club right now. "Want me to cum on you?"
Sakura was truthfully very aroused at his question, and would have happily let him cum anywhere he wanted on her body, but she figured it would feel better for him if he was able to bust deep inside the fake ass. She knew there would be plenty of opportunities for them to experiment with his ejaculations, so she shook her head and smiled.
"Go ahead and enjoy the hole," she replied. "I want to see you fill it up."
He nodded, huffed and grunted, and then drove himself as deep as he could and let loose with a deep growl. Sakura couldn't keep her fingers off her pussy as she watched him boil over and explode inside the toy. His hips were weakly thrusting into the masturbator and he was making the most delicious whimpering sounds as each burst of cum spewed out of his cock. It looked like an especially good orgasm, for which she was thankful, and she sank a finger into her cunt hole and pulled upward roughly to hit her g spot. She could almost see each pulse of his cock by watching his face contort and his ass clench. It was so fucking hot to watch her brother cum, and she was sure to imagine him looking just like this the next time she pictured him fucking her.
Benjiro relaxed and fell into the toy a bit, glancing up at the video again and watching the anal scene come to an end right behind him. The male actor was fucking a girl up the ass and had started spewing right before he yanked his cock free from her gaping hole and blasted the bulk of his load up into the air, tagging her belly and pussy in a particularly lewd display. The girl's pussy was convulsing and streams of squirt came out in small bursts. Sakura was staring more at Benjiro than the video even though he seemed very focused on it. He was still balls deep inside the masturbator as he savored the sensation.
"Fuck, that was nice," he said with a sigh. "I just woke up so horny I had to do it."
Sakura nodded happily. "Glad you did! Still worked up from Kira?"
"Yeah, I guess so." He finally pulled his cock out of the toy and tapped it against the asshole where his cum was dripping out. "Plus, I forgot how good this thing felt."
Sakura couldn't help herself and she leaned down to look closer at the toy, and his cock. She lowered her face right next to it and pretended to be looking at the dripping hole of the toy but was really licking her lips and studying Benjiro's cock. He noticed, with a wry smile, and leaned back a bit.
"You like looking at it, don't you?" he asked mischievously.
She nodded sheepishly. "Yeah, I do. Can I?"
He leaned back further onto his knuckles and thrust his cock up into the air. "Yeah, sure. Maybe we just shouldn't tell anyone, including Kira."
Sakura nodded again in agreement and reached out to touch his cock gently with her fingers. Benjiro let out a small sigh as she did that, and her pussy was on fire from the intimate contact. She didn't bother asking for his permission to touch him, or see how far he would allow her to go. She just did what she wanted at this moment and figured they would deal with it later if it needed addressing.
Benjiro was still rock hard and glistening wet from the lube and his cum. Sakura ignored the toy completely, even though she might have enjoyed licking his cum from the asshole, and instead brought her face right up to his cock in her hand. He thought she was about to lick it again, and probably would have wanted that, but instead she just held it near her face so close he could feel her breath on it. With a firm squeeze, she brought drops of cum up to the tip of his cock and gently touched it to the flat of her tongue. She lapped at his semen and savored the taste of just that small offering.
"Fuck, Sukie..." He was trembling now.
She looked up at him briefly with the most lustful gaze. "It's not like you're going to cum again, right? So it's not technically breaking the rules to touch. This is just...cleanup."
That weak justification for their incestuous contact was good enough for him, and he didn't budge an inch. He stared down at her as she pressed her lips softly against his shaft and breathed across it intentionally. Her lips rubbed against the tight skin of his penis and ran all the way up to the tip where a final drop of sperm smeared across them. She kissed his penis lovingly and sensually, her fingers finding that spot she knew he liked under his balls and lightly stroking it with her fingertip. He drew in a ragged breath and gritted his teeth when she did that.
In her mind, she knew this was wrong. She was rushing to a point that would be impossible to come back from, and if he hadn't just cum he might have rushed there with her, but this was her doing right now and her responsibility to put a stop to, unless she was ready to deal with the consequences and fallout from such a forbidden act...